If you have specific questions about how military units are organized in the modern era, I would really suggest downloading US army manuals on various topics from the era that you want more information about. For example, if you want to learn how US officers were trained to attack a city, download the manual about it, and it talks about what infrastructure to blow up first, how to handle communications, what formations to use, and so on and so forth. It's a lot more direct than reading a conventional history of a war. You can get answers to questions like "how did soldiers learn to move with stealth during the Vietnam war" by reading the manual more efficiently than you can from general histories.
I really recommend reading military material and not trying to glean things from games or fiction. The latter lean heavily on rule of cool versus rule of not dying and killing the other guy more effectively.
If you have specific questions about how military units are organized in the modern era, I would really suggest downloading US army manuals on various topics from the era that you want more information about. For example, if you want to learn how US officers were trained to attack a city, download the manual about it, and it talks about what infrastructure to blow up first, how to handle communications, what formations to use, and so on and so forth. It's a lot more direct than reading a conventional history of a war. You can get answers to questions like "how did soldiers learn to move with stealth during the Vietnam war" by reading the manual more efficiently than you can from general histories.
I really recommend reading military material and not trying to glean things from games or fiction. The latter lean heavily on rule of cool versus rule of not dying and killing the other guy more effectively.